This is a legal matter, I am not a lawyer and most that may respond here are also not lawyers.
A lack of business experience is okay everyones been there just be mindful of that inexperience when poking 800lb merchandising-rights-gorillas and the adage "if you have to ask then you can't afford it"
For awareness please seriously reconsider your business plan if your first instinct isn't talking to a lawyer when dealing with merchandise from a company like disney.
Then also consider why haven't you reached out to those companies directly.
With proper licensing or positioning of course you can make such a store on shopify.
google: "companyname merchandise licensing"
research: reseller rights, first sale doctrine, etsy resellers, reselling funkpop, etc
get: written authorization letters that your lawyer has reviewed
then no matter what be prepared for things like DMCA, or payment gateway refusal if your ducks aren't in a row